If you want to filter through and return only the prefix for your constants (i.e. you have constants with a naming scheme), then you can use this quick little function. It comes in handy for debugging.<?phpfunction returnConstants ($prefix) { foreach (get_defined_constants() as $key=>$value) if (substr($key,0,strlen($prefix))==$prefix) $dump[$key] = $value; if(empty($dump)) { return "Error: No Constants found with prefix '".$prefix."'"; } else { return $dump; }}?>Example:<?phpdefine("SITENAME_OPTION_ONE",true);define("SITENAME_OPTION_TWO",false);define("SITENAME_URL","foo");print_r(returnConstants("SITENAME_OPTION"));?>Will return:Array( [SITENAME_OPTIONONE] => 1 [SITENAME_OPTIONTWO] => )